How can I solve this: To prevent a memory leak, the JDBC Driver has been forcibly unregistered

0 votes

When I am running my web application, I am getting a message. It runs fine but I get this message during shutdown.

SEVERE: A web application registered the JBDC driver [oracle.jdbc.driver.OracleDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.

How can I handle this?

Jan 8 in Java by Sushmita
• 6,880 points
4,976 views

1 answer to this question.

0 votes

What can you do?

  1. Ignore these warnings. Tomcat is doing its job right. The actual bug is in someone else's code (the JDBC driver in question), not in yours. Be happy that Tomcat did its job properly and wait until the JDBC driver vendor get it fixed so that you can upgrade the driver. 

  2. On the other hand, you aren't supposed to drop a JDBC driver in webapp's /WEB-INF/lib, but only in server's /lib. If you still keep it in webapp's /WEB-INF/lib, then you should manually register and deregister it using a ServletContextListener.

  3. Downgrade to Tomcat 6.0.23 or older so that you will not be bothered with those warnings. But it will silently keep leaking memory. Not sure if that's good to know after all. Those kind of memory leaks are one of the major causes behind OutofMemory issue during Tomcat hotdeployments.

  4. Move the JDBC driver to Tomcat's /lib folder and have a connection pooled datasource to manage the driver. 

answered Jan 8 by Daisy
• 8,050 points

Related Questions In Java

0 votes
2 answers

How can I convert a String variable to a primitive int in Java

 Here are two ways illustrating this: Integer x ...READ MORE

answered Aug 20 in Java by Sirajul
• 39,540 points
190 views
0 votes
2 answers

How can I invoke a method when the method name is in the form of a given string?

You could probably use method invocation from reflection: Class<?> ...READ MORE

answered Aug 19 in Java by Sirajul
• 39,540 points
72 views
0 votes
2 answers

How can I get the filenames of all files in a folder which may or may not contain duplicates

List<String> results = new ArrayList<String>(); File[] files = ...READ MORE

answered Sep 12, 2018 in Java by Sushmita
• 6,880 points
624 views
0 votes
1 answer

How can I make the return type of a method generic?

First of all, define callFriend: public <T extends ...READ MORE

answered May 18, 2018 in Java by sharth
• 3,350 points
40 views
0 votes
1 answer

How to retrieve column names from java.sql.ResultSet?

You may refer the below code: ResultSet ...READ MORE

answered Jul 4, 2018 in Java by sophia
• 1,400 points
222 views
0 votes
1 answer

Establish JDBC Connection in R through single sign-on

You can certainly connect to databases with ...READ MORE

answered Sep 12, 2018 in AWS by Priyaj
• 56,940 points
374 views
0 votes
1 answer

Find Oracle JDBC driver in Maven repository

Download the jar and place it in ...READ MORE

answered Sep 26, 2018 in Java by Daisy
• 8,050 points
1,150 views
0 votes
1 answer

Accessing connection from different class in Java / MySQL?

You should just instantiate DoComms with every ...READ MORE

answered Nov 14, 2018 in Database by nirvana
• 3,060 points
49 views
0 votes
2 answers

Unfortunately MyApp has stopped. How do I solve this?

The common solution for solving App has ...READ MORE

answered Mar 6 in Java by AllisonE
• 180 points
77 views
0 votes
2 answers